This program showed what Big Al's life could have been like. This might be evidence of pack behavior, or just the result of lone individuals feeding on the same carcass. Fossils of Allosaurus were found in North America, Africa (Tanzania), Europe (Portugal) and Australia. Allosaurus weighed two tons and grew to 10.5 metres (35 feet) in length, although fossils indicate that some individuals could have reached 12 metres.